Preparation and Comparison of Internationalized Strings Representing Usernames and Passwords
draft-ietf-precis-saslprepbis-04

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Replaces draft-melnikov-precis-saslprepbis
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PRECIS                                                    P. Saint-Andre
Internet-Draft                                       Cisco Systems, Inc.
Obsoletes: 4013 (if approved)                                A. Melnikov
Intended status: Standards Track                               Isode Ltd
Expires: February 5, 2014                                 August 4, 2013

  Preparation and Comparison of Internationalized Strings Representing
                        Usernames and Passwords
                    draft-ietf-precis-saslprepbis-04

Abstract

   This document describes how to handle Unicode strings representing
   usernames and passwords.  This profile is intended to be used by
   protocols that exchange or otherwise make use of usernames and
   passwords.  This document obsoletes RFC 4013.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on February 5, 2014.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as

Saint-Andre & Melnikov  Expires February 5, 2014                [Page 1]
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  What the Username and Password Profiles Provide  . . . . . . .  3
   3.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4.  Usernames  . . . . . . . . . . . . . . . . . . . . . . . . . .  4
     4.1.  Definition . . . . . . . . . . . . . . . . . . . . . . . .  4
     4.2.  Preparation  . . . . . . . . . . . . . . . . . . . . . . .  5
   5.  Passwords  . . . . . . . . . . . . . . . . . . . . . . . . . .  6
     5.1.  Definition . . . . . . . . . . . . . . . . . . . . . . . .  7
     5.2.  Preparation  . . . . . . . . . . . . . . . . . . . . . . .  7
   6.  Migration  . . . . . . . . . . . . . . . . . . . . . . . . . .  8
     6.1.  Usernames  . . . . . . . . . . . . . . . . . . . . . . . .  8
     6.2.  Passwords  . . . . . . . . . . . . . . . . . . . . . . . .  9
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 10
     7.1.  Password/Passphrase Strength . . . . . . . . . . . . . . . 10
     7.2.  Identifier Comparison  . . . . . . . . . . . . . . . . . . 10
     7.3.  Reuse of PRECIS  . . . . . . . . . . . . . . . . . . . . . 10
     7.4.  Reuse of Unicode . . . . . . . . . . . . . . . . . . . . . 11
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 11
     8.1.  Use of IdentifierClass . . . . . . . . . . . . . . . . . . 11
     8.2.  Use of FreeformClass . . . . . . . . . . . . . . . . . . . 11
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 12
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 12
   Appendix A.  Differences from RFC 4013 . . . . . . . . . . . . . . 13
   Appendix B.  Acknowledgements  . . . . . . . . . . . . . . . . . . 14
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 14

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1.  Introduction

   Usernames and passwords are widely used for authentication and
   authorization on the Internet, either directly when provided in
   plaintext (as in the SASL PLAIN mechanism [RFC4616] or the HTTP Basic
   scheme [RFC2617]) or indirectly when provided as the input to a
   cryptographic algorithm such as a hash function (as in the SASL SCRAM
   mechanism [RFC5802] or the HTTP Digest scheme [RFC2617]).  To
   increase the likelihood that the input and comparison of usernames
   and passwords will work in ways that make sense for typical users
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